Pregnancy & Women's Health Calculators
Plan your cycle and pregnancy — ovulation, due dates and healthy weight gain in one place.
Updated June 2026 · Free · No sign-up
This cluster covers the dates and numbers that matter most across the menstrual cycle, conception and pregnancy. Start with the Ovulation calculator to find your fertile window, use the Period calculator to predict your next several cycles, and switch to the Pregnancy Due Date calculator once you conceive — it dates your pregnancy by Naegele's rule (LMP + 280 days), conception date or an ultrasound scan.
Once you know your due date, the tools map out the full journey: the Conception calculator works dates either way, while the Pregnancy Weight Gain calculator translates your pre-pregnancy BMI into a recommended gain range for a healthy pregnancy. Indian clinicians often apply the lower WHO Asia-Pacific / ICMR BMI cutoffs, so an Indian woman may fall in a higher BMI band than the global chart suggests — worth knowing when reading any weight-gain target. These are planning and screening tools and do not replace your gynaecologist or antenatal (ANC) checkups.
All Pregnancy & Women's Health Calculators
Pregnancy / Due Date Calculator
Calculate pregnancy due date using Naegele's rule (LMP + 280 days), conception date, or ultrasound dating. Shows current week, trimester boundaries, and all key milestone dates — first heartbeat, anatomy scan, viability, full-term.
Due Date Calculator
Calculate your baby's estimated due date, trimester milestones, and key pregnancy dates.
Conception Date Calculator
Estimate conception date from due date, or calculate due date from conception date.
Ovulation Calculator
Find your most likely ovulation date and 6-day fertile window based on LMP and cycle length. Shows next 3 cycles with conception-best days highlighted. Pairs with Period and Pregnancy Due Date calculators.
Period Calculator
Predict your next 6 menstrual periods with start dates, fertile windows, ovulation dates, and PMS windows side-by-side. Customisable cycle length and period duration; tracks cycle regularity.
Pregnancy Weight Gain Calculator
Calculate recommended weight gain during pregnancy based on pre-pregnancy BMI and guidelines.
Frequently asked questions
How is a pregnancy due date calculated?
The standard method is Naegele's rule: add 280 days (40 weeks) to the first day of your last menstrual period (LMP), which assumes a regular 28-day cycle. If your cycle is longer or shorter, or you have an early ultrasound, dating from the scan or known conception date is more accurate. Only about 1 in 20 babies actually arrive on the exact due date — it is an estimate, not a fixed appointment.
When am I most likely to get pregnant?
Conception is most likely during your fertile window — roughly the five days before ovulation plus the day of ovulation itself, because sperm can survive a few days inside the body. In a typical 28-day cycle, ovulation falls around day 14, but it shifts with your cycle length. The Ovulation and Period calculators estimate this window from your LMP and average cycle length.
How much weight should I gain during pregnancy?
Recommended total weight gain depends on your pre-pregnancy BMI: broadly 11–16 kg if you started at a healthy weight, more if underweight and less if overweight or obese. Because Indian guidelines use lower WHO Asia-Pacific / ICMR BMI cutoffs, your category may differ from the global chart, so confirm your target with your doctor. The calculator gives a guideline range only — your obstetrician sets the right goal for you.
Are these calculators a substitute for seeing a doctor?
No. They are screening and planning tools that estimate dates and ranges from the information you enter; they cannot diagnose pregnancy, fertility issues or any medical condition. A positive home test should always be confirmed clinically, and regular antenatal checkups remain essential. Use these results to prepare for your appointments, not to replace them.
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